Question

Twenty-three overweight male volunteers are randomly assigned to three different treatment programs designed to produce a weight loss by focusing on either diet, exercise, or the modification of eating behavior. Weight changes were recorded, to the nearest pound, for all participants who completed the two- month experiment. Positive scores signify a weight drop; negative scores, a weight gain.

(a) Summarize the results with an ANOVA table.
(b) Whenever appropriate, use Tukey’s HSD test and estimate all effect sizes, given that the means for diet, exercise, and behavior modification equal 2.75, 2.00, and 7.00, respectively.